[issue16251] pickle special methods are looked up on the instance rather than the type

[Łukasz Langa]

Changes by Łukasz Langa <lukasz at langa.pl>:


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versions: +Python 3.6, Python 3.7 -Python 3.5

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue16251>
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